#include<stdio.h>
//命名空间 域
namespace bit{
  int a = 0;
  int b = 1;
  int c = 2;
}

using bit::b;  //单独展开

using namespace bit;//全部展开
int main()
{
  printf("%p\n",scanf);

  //print
  printf("%d\n",bit::a);
  printf("%d\n",b);
  printf("%d\n",c);

  return 0;
}
